High-Density Magnetic Head Design for Noncontact Recording

The information storage density in digital magnetic recording is dependent on both the pulse resolution and the track definition. This paper is concerned with these two factors in the design of magnetic heads for noncontact recording.1 A concept of changed pole-tip geometry which led to a significant improvement of pulse resolution is introduced. A general expression based on ``single-pulse'' superposition is derived for various bit densities2 and data codes. In addition, several recording methods are discussed for achieving near-maximum track density2 under various head-repositioning error3 conditions. As shown, high-density heads for noncontact recording have been designed successfully by applying the concept and techniques developed. Good correlation has been realized between analytical and experimental results. Performance characteristics under simulated machine conditions are presented.